I have heard of it, but I'm wary because I see its name on Hackernews-eqsue / freezepeach / libertarian-techy crowds. These are minor "guilt-by-assocation' things though. I think a lot of us vaguely fit some or all of these categories, but it makes me worry it could turn out to be another of the myriad poorly-secured righty grifts.

The head of Kagi was VP of Product for GoDaddy for awhile, and also has ventures in blockchain email and precision drones (for cargo delivery?) These are also just minor flags. (I can't blame someone too much for optimistically heading a blockchain app six years ago.)

All in all, I love the idea in theory, but a search engine is a deeply personal thing that's hard to build trust in. Google is the devil I know, etc etc.